package utils;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import java.io.*;
import javax.imageio.*; 
import java.util.*;
import javax.imageio.stream.*;  
import com.et.mvc.MultipartFile;

public final class ImageUtil {
    public ImageUtil() {
 
    }
    
    public static boolean isImageFile(MultipartFile f) throws Exception{
    	String format =  getFormatName(f.getInputStream());
    	if (format.equals("JPEG")) return true;
    	if (format.equals("png")) return true;
    	if (format.equals("gif")) return true;
    	return false;
    }
    
    
    /** 
     * 检查传入file的format名称 
     * @param f 传入的文件 
     * @return 
     */  
    public static String getFormatInFile(MultipartFile f) throws Exception{      	
        return getFormatName(f.getInputStream());  
    }  
     
    /** 
     * 对文件进行format检索 
     * .jpg .jpeg .jpe .jfif ===> JPEG 
     * .png ===> png 
     * .gif ===> gif 
     * . 
     * @param o 
     * @return 
     */  
    // Returns the format name of the image in the object 'o'.  
    // Returns null if the format is not known.  
    private static String getFormatName(Object o) {  
        try {  
            // Create an image input stream on the image  
            ImageInputStream iis = ImageIO.createImageInputStream(o);  
     
            // Find all image readers that recognize the image format  
            Iterator<ImageReader> iter = ImageIO.getImageReaders(iis);  
            if (!iter.hasNext()) {  
                // No readers found  
                return null;  
            }  
     
            // Use the first reader  
            ImageReader reader = (ImageReader) iter.next();  
     
            // Close stream  
            iis.close();  
     
            // Return the format name  
            return reader.getFormatName();  
        } catch (IOException e) {  
            //  
        }  
     
        // The image could not be read  
        return null;  
    }  
    
    /**
     * public final static String getPressImgPath() { return ApplicationContext
     * .getRealPath("/template/data/util/shuiyin.gif"); }
     */
 
    /**
     * 把图片印刷到图片上
     * 
     * @param pressImg --
     *            水印文件
     * @param targetImg --
     *            目标文件
     * @param x
     *            --x坐标
     * @param y
     *            --y坐标
     */
    public final static void pressImage(String pressImg, String targetImg,
            int x, int y) {
        try {
            //目标文件
            File _file = new File(targetImg);
            Image src = ImageIO.read(_file);
            int wideth = src.getWidth(null);
            int height = src.getHeight(null);
            BufferedImage image = new BufferedImage(wideth, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics g = image.createGraphics();
            g.drawImage(src, 0, 0, wideth, height, null);
 
            //水印文件
            File _filebiao = new File(pressImg);
            Image src_biao = ImageIO.read(_filebiao);
            int wideth_biao = src_biao.getWidth(null);
            int height_biao = src_biao.getHeight(null);
            g.drawImage(src_biao, (wideth - wideth_biao) / 2,
                    (height - height_biao) / 2, wideth_biao, height_biao, null);
            //水印文件结束
            g.dispose();
            FileOutputStream out = new FileOutputStream(targetImg);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(image);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 打印文字水印图片
     * 
     * @param pressText
     *            --文字
     * @param targetImg --
     *            目标图片
     * @param fontName --
     *            字体名
     * @param fontStyle --
     *            字体样式
     * @param color --
     *            字体颜色
     * @param fontSize --
     *            字体大小
     * @param x --
     *            偏移量
     * @param y
     */
 
    public static void pressText(String pressText, String targetImg,
            String fontName, int fontStyle, int color, int fontSize, int x,
            int y) {
        try {
            File _file = new File(targetImg);
            Image src = ImageIO.read(_file);
            int wideth = src.getWidth(null);
            int height = src.getHeight(null);
            BufferedImage image = new BufferedImage(wideth, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics g = image.createGraphics();
            g.drawImage(src, 0, 0, wideth, height, null);
 
            g.setColor(Color.RED);
            g.setFont(new Font(fontName, fontStyle, fontSize));
 
            g.drawString(pressText, wideth - fontSize - x, height - fontSize
                    / 2 - y);
            g.dispose();
            FileOutputStream out = new FileOutputStream(targetImg);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(image);
            out.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
 
    public static void main(String[] args) {
        pressImage("F:/logo.png",          "F:/123.jpg", 0, 0);
    }
}